Pumping jack



Sep 1 I929. E. E. STEVENSON PUMPING JACK Filed Feb. 8, 1926 4 Sheets-Sheet ill a W MYp/ 3y 4.

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,Sept. 10, 1929.

E. E. STEVENSQN PUMPING JACK Filed Feb. 8, 1926 4 Sheets-Sheet 2- war/16g.

Sept. 10, 1929. E. E. STEVENSON PUMPING JACK 4 sheets-Sheet 5 Filed Feb. 8, 1926 Sept. 10, 1929. E. E. STEVENSON PUMPING JACK Filed Feb. 8, 1926 4 Sheets-Sheet 4 Patented Sept. 10, 1929.

UNITED STATES PATENT OFFICE.

EDWARD E. STEVENSON, OF LOS ANGELES, CALIFORNIA, ASSIGNOR, BY MESNE AS- SIG-NMENTS, TO EMSCO DERRICK & EQUIPMENT COMPANY, OF LOS ANGELES, CALI- FORNIA, A CORPORATION OF CALIFORNIA.

PUMPING JACK.

Application filed February 8, 1926. Serial No. 86,691.

This invention relates generally to pump jacks or power heads such as are used for reciprocating deep well pumps of the plunger type, and more particularly concerns jacks or heads of the type wherein straight line reciprocatory movement is generated by the use of double cranks in association with planetary gearing.

In a patent issued to me October 9, 1926, entitled Pump jack, No. 1,603,926, I have discussed generally the acknowledged superiority of the straight line or rectilinear type of head over the well known Walking beam pump jack, and also discussed the common weaknesses of the usual straight line jack. The points raised in said patent are well known to those skilled in the art, and need not be again discussed here. The jack here disclosed is of the general type disclosed in said patent, but certain structural changes have been made to render it more adaptable to the severe service conditions to which a device of this kind is exposed. When it is remembered that a ack of this type weighs in the neighborhood of four or five thousand pounds, and is called upon to reciprocate a string of sucker rods several thousand feet in length and lift a column of oil of corresponding length, it will be understood that the device must be built in exceedingly heavy form. Yet, in order that it may be efficient in operation, it is requisite that it operate without the expenditure of excessive power, and that its parts be accessible for replacement, attention and repair.

Therefore, it may be considered as the general object of the present invention to prvide a straight line head of simple and efficient nature, one which is capable of being stoutly built without being overmassive, and one in which the working parts are so relatively arranged that they operate to the best advantage.

A better understanding of the invention will be had from the following detailed description, reference being made to the accompanying drawings, in which:

Fig. 1 is a front elevation of a pump jack embodying my invention;

Fig. 2 is aside elevation of the jack;

Fig. 3 is an enlarged section on line 3-3 of Fig. 1;

Fig. 4 is a detached enlarged view of the main crank spider;

Fig. 5 is an enlarged, fragmentary View of Fig. 3 as viewed from the position of arrow 5;

Fig. 6 is a section on line 6-6 of Fig. 5; and

Fig. 7 is a detached plan view of a rod grip of a type preferably used in connection with my ack.

First, I will describe the supporting structure or member of the head with some particularity, but it will be understood that the nvention, considered in its broader aspects, is not limited to this particular showing.

Supporting frame 10 includes horizontally spaced shoe angle irons 11 to which are riveted side plates 12; shoes 11 having in their horizontal flanges 13 a plurality of apertures 14 to take anchor bolts 15 which extend through skid-irons 16 into the derrick floor F or any other suitable foundation or footmg.

An inverted U-member 16, preferably of channel cross-section with flanges 17 turned out, extends upwardly from the shoe irons, being riveted to said irons at 18 and to plates 12 at 19. Diagonal braces 20 and 21 extend from plates 12 to member 16, being riveted to said member at 22 and 23, respectively. Riveted at 24 to member 16 (which may be termed a gear supporting member) is a face plate 25 having a central aperture 26 of a size to permit free rotation of the crank mechanism, to be described. Depending from the center of the arch of member 16 and at the side opposite plate 25, is a vertical channel member 27, the flanges of which are cut away below piece 28. Extending from leg to leg of member 16 is a horizontal channel 29,. this channel being riveted to the legs atand to vertical channel 27 at 31. Spaced below channel 29 is a horizontal angle iron 32 which is bolted to a flange of member 16 at 33, and channel 29 and angle 32 are adapted to sup port between them a bearing block 34 carrying a bearing 35 in any suitable manner. Vertical tension rods 36 preferably connect channel 29 and angle iron 32 at the sides of block 34 for an obvious purpose.

Rear legs 36 are riveted at 37 to the turnedin ends 38 of side plates 12 and thence incline upwardly and inwardly towards bearing block 39, being bolted at 40 to arcuate flange 41 of this block (see Figs. 5 and 6). Block 39 has an overhanging cap portion 42 to which is bolted at 43 a horizontal cross bar 44, the latter being secured at its opposite extremity to channel 27 through angle iron 45. Depending from flange 41 and secured thereto by bolts 40, is a rear plate 46. Plate 46 carries at its lower extremity a horizontal angle iron 47 which is riveted to legs 36 at 48. Spaced below angle iron 47 is a second angle iron 49, the ends of which are bolted to legs 36 at 50. Supported between angle irons 47 and 49 is a bearing block 51 which carries a bearing 52 of any suitable type, this bearing being in axial alinement with bearing 35. Bearings 35 and 52 are journals for drive shaft 53 which carries a spur gear 54 at one end, a sprocket 55 adapted to be driven from any suitable power source (not shown) at the other end, and a balance wheel 56 intermediate channel 16 and legs 36.

A bearing block 57 is secured to channel 27 by rivets 58, this hearing block carrying any suitable bearing 59 in axial alinement with hearing 60 carried by block 39, and substantially in axial alinement with aperture 26 and the arcuate portion of channel 16. Channel 27 is apertured at 61 to take main crank shaft 62 which is journaled in bearings 59 and 60.

8 Face plate 25 carries or may be considered as an element of an internal gear generally designated at 63, which, in its preferred form, is of lantern wheel type, that is, the teeth are in the form of bars or rollers (here they are shown as rollers) held between laterallyspaced plates; though it lies within the scope of my claims to substitute any other suitable type of internal gear. I utilize face plate 25 as one of the lantern wheel plates, the other wheel plate being in the form of a ring 64 of angular cross-section, the edge of one of the ring flanges being leld in engagement with plate 25 by bolts 65 which extend from the other ring flange to the face plate. Bolts 65 are arranged in a circle which is concentric with crank shaft 62 and serve to support removable roller 66, these rollers preferably being free to revolve upon the bolts and functioning as the teeth of gear 63. The main crank, generally designated by numeral 67, in preferred form may be described as a forked one, the fork arms being spaced apart sufficiently to take a spur gear 68, this gear having a pitch diameter equal to one-half the pitch diameter of gear 63. The crank is made up of two spaced spiders 69 and 70. The hub 71 of spider 69 is preferably, though. not

' necessarily, made integral with crank shaft 62, and from this hub radiate the relatively long arms 72 and relatively short crank arm 73, the latter supporting a bearing 74 at its free extremity 7 Preferably, the end or hub 75 of arm 73 is connected to adjacent arms 72" by webs 76 (see Fig. 4).

Bolted at 77 to the extremities of longer arms 72 and held in concentric relation with crank shaft 62, is a ring gear 78, which is meshed with and adapted to be driven by spur gear 54. Spider 7 0 is made up of the three arms 78, 79 and 80 which radiate from a com mon hub 81, said hub carrying a bearing 82 in alinement with bearing 74 in arm 73. The free ends of arms 78, 79 and 80 turn inwardly at- 83 to meet hub 71, being bolted thereto at 84. Spur gear 68 has an elongated hub 85 which is journaled in bearing 82, and through this hub extends a coaxial keeper pin 86 having a head 87 at one and extending at the other end beyond gear 68 at 88, where it is journaled in bearing 74. Retention nuts 89 are threaded on the end of pin 86 beyond hearing 74.

Connection between the jack, proper, and the pump rod P is made through a secondary crank pin, or its equivalent, which is rotated by gear 68. Now, itis necessary that the projected longitudinal axis of this pin or, in other words, the relative axis of rotation between the rod grip G and gear 68, meet the pitch circle of the spur gear in order that true, vertical straight line reciprocation may be imparted to said grip and to the rod P to which the grip is attached. Therefore, connection between the grip G and wheel 68 is made through a secondary crank arm 90, this arm having a hub 91. keyed at 92 to hub 85. Hub 91 is countersunk at 93 to take a keeper ring 94 which is countersunk at 95 to take pin head 87. When nuts 89 are taken up, head 87 holds ring 94 against shoulder 96 of hub 91 and against the end of hub 85, thus serving to hold the secondary crank from movement longitudinally along hub 85, and holding bearings 74, 82. gear 68 and crank arms 73, 70 in proper assembled relation. Thus, the pin indirectly serves to maintain gear 68 in constant mesh with gear 63.

A counter-weight 97 is arranged diametrically opposite gear 68, spider 69, 7 O, crank arm 90 and grip G. The counter-weight is so arranged that its center of mass lies approximately in the vertical plane of the center of mass of the structure which it counterbalances, this being a feature of self-evident advantage. The counter weight is preferably secured to spider 69 by arms 98 which are bolted to the weight at 99 and to the spider 69 at 77 and 100'.

The secondary crank or wrist pin 101 is retatably mounted in bearings 102 carried by the end of secondary crank 90, 1 thereby being enabled to connect the wrist pin rigidly to rod P, instead of providing a bearing collar on the pin. The wrist pin is so located that the center to center distance between it and pin 86 is equal to the pitch radius of gear 68.

I may employ any suitable type of grip between crank arm 90 and rod P without departing from the spirit and scope of my broader claims. but I prefer to utilize the type of grip here illustrated, which is the subject-matter of certain claims in my patent. aforemeir tioned. However, this grip is shown somewhat in detail in Fig. 7. The body portion 103 of the grip is made integral with pin 101 and extends transversely therebeyond in order to engage one side face of hub 90 of arm 90 to limit longitudinal movement of said pin in one direction. Nut 10a is threaded on the free extremity of pin 101 and thrusts the right hand bearing 102 to the left against internal flange 105 of cup member 106 which member extends into the bore of hub 90 and has an external flange 107 bolted at 108 to the end of said hub. Thus the cup member, hearing and nut coact in a manner to hold the grip and pin 101 against longitudinal movement in the opposite direction. The bore of hub 90 may be closed by a removable plate 109.

Body member 103 of the grip has a vertically extending channel 110 which opens to one side of the body member, and horizontally slidable clamping eyes 111 are carried by the body member, being movable towards and away from channel 110 by manipulation of nuts 112 which are threaded on shan {S 113 of clamping eyes 111. The apertures 114 of the clamping eyes are of substantially oval out line as viewed in plan, the minor axes of the ovals being such that rod P may be taken therein with easy fit, while relative transverse movement of rod and eye tends to wedge them tightly together. Channel 110 is wedge shaped, considered in transverse cross-section, tapering inwardly from its mouth, and is so located and of such proportions that when rod P of given diameter is tightly engaged by the opposite walls of the channel. due to clamping movement of eyes 111, the longitudinal axis of the rod is in the vertical axial plane of pin 101.

Assuming that power from any suitable source (not indicated) he delivered through sprocket to rotate shaft 58 and hence gears 54, 78, and crank shaft 62 in a clockwise direction as viewed in Fig. 1, it will be seen that gear 68 and crank arm are simultaneously caused to rotate in a countercloclnvise direction, since gear 68 is maintained in constant mesh with fixed gear 63. The resultant movement of secondary crank or wrist pin 101 and hence of grip G is of a rectilinear nature, or may be described as straight line vertical. reciprocation. It is believed unnecessary to trace the movement of the secondary pin, as the principle of operation is an old one and well known to those skiled in the art.

It will be seen that by reason of the relative disposition of the various elements, the moving mechanism is kept close to the vertical plane of the pump rods, the absence of any appreciable degree of overhang of grip G with respect to the driving mechanism being a feature of very decided advantage. The application of drive force from shaft 53 directly to the member which supports gear 68, arm 90 and their associated mechanisms, is also a feature of advantage as will be well understood.

It will be understood the drawings and description are to be considered merely as illustrative of and not restrictive on the broader claims appended hereto, for various changes in design, structure and arrangement may be made without departing from the spirit and scope of said claims.

I claim:

1. A power head for deep well pumps, that includes a supporting member, an internal gear stationarily fixed on the member, a crank shaft journaled on the member, a forked main crank on the shaft, a spur gear having an elongated hub extending from one side thereof, said hub being journaled in one of the arms of the crank fork, a secondary crank non-rotatively mounted on the hub beyond its point of bearing support, a keeper pin coaxial with and extending through the hub and having bearing in the other arm of. the crank fork, said pin being adapted to hold the secondary crank against separative movement and to hold the spur gear in mesh with the internal gear, means for transmitting rotary motion to the crank shaft, the diameter of the internal gear being twice that of the spur gear, all in a manner whereby one revolution of the crank shaft in a given direction causes the spur gear to rotate one revolution in the opposite direction; and a rod grip carried by said secondary crank.

2. A power head for deep well pumps, that includes a supporting member, an internal gear stationarily fixed on the member, a crank shaft journaled on the member, a forked main crank on the shaft, a spur gear having an elongated hub extending from one side there of, said hub being journaled in one of the arms of the crank fork, a secondary crank non-rotatively mounted on the hub beyond its point of bearing support, a keeper pin coaxial with and extending through the hub and having bearing in the other arm of the crank fork, said pin being adapted to hold the spur gear in mesh with the internal gear, means for transmitting rotary motion to the crank shaft, the diameter of the internal gear being twice that of the spur gear, all in a manner whereby one revolution of the crank shaft in a given direction causes the spur gear to rotate one revolution in the opposite direction; and a rod grip carried by said secondary crank.

3. A power head for deep well pumps, that includes a supporting member, an internal gear stationarily fixed on the member, a crank shaft ournaled on the member, a forked main crank on the shaft, a spur gear having an elongated hub extending from one side thereof,

said hub being journaled in one of the arms of the crank fork, a secondary crank non-rotatively mounted on the hub beyond its point of bearing support, a keeper pin coaxial with and extending through the hub and having bearing in the other arm of the crank fork, said pin being adapted to hold the spur gear in mesh with the internal gear, means for transmitting rotary motion to the crank shaft, the diameter of the internal gear being twice that of the spur gear, all in a manner whereby one revolution of the crank shaft in a given direction causes the spur gear to rotate one revolution in the opposite direction, a wrist pin on the secondary crank and rotatable with respect thereto, and a rod grip carried by said wrist pin.

4:. A power head for deep well pumps, that includes a supporting member, an internal gear stationarily fixed on the member, a crank shaft journaled on the member, a forked main crank on the shaft, a spur gear having an elongated hub extending from one side thereof, said hub being journaled in one of the arms of the crank fork, a secondary crank non-rotatively mounted on the hub beyond its point of bearing support, a keeper pin coaxial with and extending through the hub and having bearing in the other arm of the crank fork, said pin being adapted to hold the spur gear in mesh with the internal gear, means for transmitting rotary motion to the crank shaft, the diameter of the internal gear being twice that of the spur gear, all in a manner whereby one revolution of the crank shaft in a given direction causes the spur gear to rotate one revolution in the opposite direction; and a relatively rotatable rod grip carried by said secondary crank.

5. In a device of the character described, a supporting member, an internal gear stationarily fixed to the member, a crank shaft journaled on the member, a forked crank on the shaft, a spur gear having a hub extending from one side thereof, said hub being journaled in one of the arms of the crank fork, and a pin coaxial with and extending through the hub and from the other side of the spur gear and having bearing in the other arm of the crank fork, the spur gear be ing in mesh with the internal gear and its diameter being one-half that of the internal ear.

D 6. In a device of the character described, a supporting member, an internal gear stationarily fixed to the member, a crank shaft journaled on the member, a forked crank on the shaft, a spur gear having a hub extending from one side thereof, said hub being journaled in one of the arms of the crank fork, a pin coaxial with and extending from the other side of the spur gear and having bearing in the other arm of the crank fork, the spur gear being in mesh with the intergear and its diameter being one-half that of the internal gear, a secondary crank connected to said spur gear to rotate therewith, a wrist pin on the secondary crank and r0- tatable with respect thereto, and a rod taking member carried by said wrist pin.

T. In a device of the character described, a supporting member, an internal gear stationarily fixed to the member, a crank shaft journaled on the member, a forked crank on the shaft, a spur gear having a hub extending from one side thereof, said hub being ournaled in one of the arms of the crank fork, a pin coaxial with and extending from the other side of the spur gear and having bearing in the other arm of the crank fork, the spur gear being in mesh with the internal gear and its diameter being one-half that of the internal gear, a secondary crank connected to said spin gear to rotate therewith, and a relatively rotatable rod taking member carried by said secondary crank.

in :1 device of the character described, a sup orting member, an internal gear staly fizvd to the member, a crank shaft journalial on the member, a forked crank on the shaft, spur gear having a hub extendom one side thereof, said hub being jouri sled in one of the arms of the crank fork, a pin coaxial with and extending from the other side of the spur gear and having bearing in the other arm of the crank fork, the spur gear being in mesh with the internal gear and its diameter being one-half that of the internal gear, a secondary crank nonrotatively mounted on the hub, and a rod taking member carried by said secondary crank.

9. In a device of the character described, a stationary internal gear, a crank shaft disposed centrally of said gear, a main crank on the shaft, said crank being characterized as a pair of separable arms spaced apart in the direction of the shaft axis near their outer ends and detachably held together near their inner ends, and a spur gear mounted for rotation between the arms, the spur gear being in mesh with the internal gear and its diameter being one-half that of the internal gear.

10. In a device of the character described, a stationary internal gear, a crank shaft disposed centrally of said gear, a main crank on the shaft, said crank being characterized as a pair of separable spiders having portions spaced apart in the direction of the shaft axis and having other portions detachably held together, and a spur gear mounted for rotation between the spaced-apart portions of the spiders, the spur gear being in mesh with the internal gear and its diameter be ing one-half that of the internal gear.

11. In a device of the character described, a stationary internal gear, a crank shaft disposed centrally of said gear, a main crank on the shaft, said crank being characterized as a pair of spiders having portions spaced apart in the direction of the shaft axis, a spur gear mounted for rotation between the spaced-apart portions of the spiders, the spur gear being in mesh with the internal gear and its diameter being one-half that of the internal gear; and a counterbala ce secured to one of the spiders.

12. A power head for deep well pumps comprising: a supporting member; an internal gear stationarily fixed to said supporting member; a crank shaft ournaled on said supporting member; a spider carried at one end of said crank shaft, said spider having ring-gear supporting arms and a crank; a ring-gear secured to said ring-gear supporting arms and surrounding said crank; means for driving said ring-gear to operate said crank; a spur gear rotatably supported by said crank in a position toengage said internal gear; and a rod grip operatively connected to said spur gear.

13. A power head for deep well pumps comprising: a supporting member; an internal gear stationarily fixed to said supporting member; a crank shaft journaled on said supporting member; a spider formed integrally on one end of said crank shaft, said spider having ring-gear supporting arms and a crank; a ring-gear secured to said ring-gear supporting arms and surrounding said crank; means for driving said ring-gear to operate said crank; a spur gear rotatably supported by said crank in a position to engage said internal gear; and a rod grip operatively connected to said spur gear.

14. A power head for deep well pumps comprising: a supporting member; an internal gear stationarily fixed to said supporting member; a crank shaft ournaled on said supporting member; a spider carried at one end of said crank shaft, said spider having ringgear supporting arms and a crank; a ringgear secured to said ring-gear supporting arms and surrounding said crank; means for drivin" said ring-gear to operate said crank; a spur gear rotatably supported by said crank in a position to engage said internal gear; a rod grip operatively connected to said spur gear; counterweight carrying arms secured to said. spider and extended outward on one side of said internal gear; and a counterweight secured to said counter-weight carrying arms, said countenweight moving in a path surrounding said internal gear.

15. A power head for deep well pumps comprising: a supporting member; an internal gear stationarily fixed to said supporting member; a crank shaft journaled on said supporting member; a spider formed integrally on one end of said crank shaft, said spider having ring-gear supporting arms and a crank; a ring-gear secured to said ring-gear supporting arms and surrounding said crank; means for driving said ring-gear to operate said crank; a spur gear rotatably supported by said crank in a position to engage said in ternal gear; a rod grip operatively connected to said spur gear; counter-weight carrying arms secured to said spider and extended outward on one side of said internal gear; and a counter-weight secured to said counterweight carrying arms, said counter-weight moving in a path surrounding said internal gear.

In witness that I claim the foregoing I have hereunto subscribed my name this 14th day of January, 1926.

ED'WARD E. STEVENSON. 

